One of the mysteries of the English language finally explained.
1‘an off-the-cuff remark’
impromptu, extempore, ad lib
unrehearsed, unscripted, unprepared, improvised, spontaneous, unplanned
2‘I spoke off the cuff’
without preparation, without rehearsal, impromptu, ad lib
off the top of one's head, on the spur of the moment
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